Internal-combustion engine



July 23, 1929.. c. H. KENDALL INTERNAL COMBUSTION ENGINE Filed May 29,1928 2 Sheets-Shet 1 a 221-55555" ELKen 6 LTZLHS July 23, 1929' c. H. L.KENDALL."

INTERNAL COMBUSTION ENGINE 2 Sheets-Sheet Filed May 29 1928 PatentedJuly 23, 1929.-

enemas n. L. KENDALL, or wna'rnnronn, oxmnom.

'mrnnNAL-conmusnon ENGINE.

Application filed May 29, 1928. Serial 1%. 281,488.

This invention relates to internal combustion engines and more partcularly .to a means for preventing lubricant losses ordinarily occurringat the end main bearings of the engine.

Afurther object of the invention is to provide means for positivelywithdrawing oilfrom the wells of such bearings so that its capillaryloss about the crank shaft from- A further object of the invention isthe production of a device of this character which, in addition toperforming its function of preventing oil looses, supplies to thecarbureter gases ,withdrawn from the-interior of the engine. v

A still further object of the invention is the production in a device ofthis character of a construction such that liquids are removed froin theair drawn from the base of the engine before this air is delivered to thcarbureter. Y i

These and other objects I attain by the construction shown in the,accompanying drawings, wherein for the 'purpose of illus-- tration isshown a preferred embodiment of my invention and wherein Figure 1 is aside elevation of the rear main bearing of the crank shaft of aninternal combustion engine showing a lubricant control means appliedthereto in accordance with my invention;

Figure'2 is a vertical transverse sectional view through the bearing;

Figure 3 is a section on the line 33 of Figure 2; i I

Figure 4 is an enlarged section on the line 4-4 of Figure 2; Figure 5 isasection' on-the line 55 of Fi re 4;

1 re -Fi u h 4.

, eferring now more particularly 6 is a section on the line 6-6 ofdrawings, the numeral 10 generally desigto the nates the rear mainbearing of a crank shaft and 11 the crank shaft. As is' well known tothose familiar with the art, in engines where forced lubrication isemployed, the outer ends of such bearings are formed with annulargrooves 12 and the'shaft is formed with a flange 13 operating in thisgroove, the theory being. that oil passing outwardly along the shaftwill enter this well from which it may return through a port 14 to thebase of the engine. As a matter of fact, while the mayor portion of theoil will return to the englne through this port, when there is anypressure in the base of the engine, this pressure acting through theport upon the oil tends to cause the same to be forced outwardly uponthe shaft so that it escapes.

Furthermore, capillary action has a constant tendency to cause oilseepage :at this point.

In accordance with. my invention, I arrange within the engine base anarcuately curved tube 15, one end of which is closed, as indicated at16. This tube has openings formed through the wall thereof at 17 adacentits closed end and these openings are.

provided With-hoods 18 preventing splashed oil from entering the same.

The opposite end of this tube is provided with an angular extension 19passing through the wall of the base at 20. At its approximate center,the tube is provided with a drain outlet 21 which may be led to the oilsump. A'

tube 22 has one end thereof connected with the port 14 and the oppositeend extended into the tube 15 between the closed end thereof and oiloutlet 21 and in close proximity to the latter. The tube 22 Within thetube 15 is formed asa jetbeing V-shaped in cross section and having itsapex 23 directed toward 1 the closed end of the tube. The walls of thetube are cut away at this nozzle from the apex 23 with a slanting cut.'The diverging walls act to create a vacuum within the tube 22 upon thepassage of air or gases through the tube toward the outlet end thereofand thus create suction at the bearing. It will be obvious thatapparatus of this character will, of itself prevent the losses whichordinarily occur due to pressure in the base, since this bottom of thesump, the outlet tube 21 has openings 26 for the passage of oilcollected in the sump and baflles 27 are preferably provided fordirecting solids, contained in the bricant from the end bearings of thecrank gases and air passing through the tube, into the sump. Thesebaflles may be conveniently produced by continuing thelower wall of thetube over the sump and then slotting and bending the same, as moreclearly shown in Figure 2.

, While the suction afforded by the escape of pressure gas will provesufiicient, in many instances, I preferably provide in combination withthe structure just described a tube 28 of considerably smaller diameterthan the tube 15 which is extended intothe outlet end of the tube at oneend and has its opposite end projected into the intake pipe 29 of the.

carbureter 30 of the engine. The additional suction thus provided notonly accelerates movement of the air and gases through the tube 15 butcauses a tendency to separation of the heavier from the lighterparticles thereof, the lighter particles passing into the tube 28, whilethe heavier particles, which are mostly oil, will pass down the tube 15to the.

sump 24.

Such a device may be readily applied to any make of internal combustionengine as the several tubes employed will occupy but little space andwill not interfere in any way with the normal operation of the engine.

It will be obvious that the specific construction hereinbefore set forthis capable of a certain range of change and modification withoutmaterially departing from the spirit of the invention and I accordinglydo not limit myself to such specific structure except 1 as hereinafterclaimed.

I claim 1. In combination with an internal combustion engine having theusual base and main bearing for the crank shaft thereof which isprovided with a lubricant well, an escape tube or pressure gasescollecting in the base, an eduction tube connecting the lubricant welland the ,tube and within the tube formed as an aspirating nozzle,andmeans in the escape tube between the outlet end thereof and saidnozzle for separating oil from air and gases passing through the-escapetube and returnmg the same to the baseof the engine.

2. In combination with an internal combustion engine having the usualbase and main provided with a lubricant well, an escape tube forpressure gases collecting in the base, an eduction tube connecting thelubricant well and the tube and within the tube formed as an aspiratingnozzle, means in the escape tube between the outlet end thereof and saidnozzle for separating oil from air and gases passing through the escapetube and returning the same to the base of the engine, and a thirdtubeof less diameter than the escape tube extended into the outlet endof the escape tube at one end and having its opposite end incommunication with a source of suction.

3. The method of preventing escape of lushaft of an internal combustionengine resultmg from the accumulation of pressure in the base of theengine consisting in providing 5. In combination with an internal combustion engine having the usual base and main bearing for the crank shaftthereof which is provided-with a lubricant well, an escape tube forpressure gases collecting in the base, an eduction tube connecting thelubricant well and the tube and within the tube formed as an aspiratingnozzle, an outlet in the escape tube between the outlet end thereof andsaid nozzle, and means in the escape tube for directing oil passingtherethrough to said outlet.

6. In combination with an internal combustion engine having the usualbase and main bearing for the crank shaft thereof which is provided witha lubricantwell, an escape tube for pressure gases collecting in thebase, an eduction tube connecting the lubricant well and the tube andwithin the tube formed as an aspirating nozzle, an outlet in the escapetube between the outlet end thereof and said nozzle, means in the escapetube for directing oil passing therethrough to said outlet, the outletincluding a funnel-shaped sump, and a tube extending through the bottomof the said sump and having its upper end extending into the escape tubeand provided with an opening facing the inlet end of theescape tube.

7 In combination with an internal combustion engine .having the usualbase and main bearing for the crank shaft thereof escape tube forpressure gases collecting in the base, an eduction tube connecting theInbricant well and the tube and within the tube .which is provided witha lubricant well, an

' memes "3 formed as an aspirating nozz1e,wan outlet in end extendinginto the escape tube and prothe escape tube between the outlet endthereof vided with an opening facing the inlet end of and said nozzle,means in the escape tube for the escape tube, said tube ad acent thebottom 1 directing oil passin therethrough to said of the sump haopening? formed therein. 7

5 outlet, the outlet inc udl'ng a funnel-shaped In testimony w ereof Iereunto aflix my sump, and a tube extending through the botsignature.

,tom of the said sump. and having its upper CHARLES H. L. KENDALL.

